JPS601497A - Protector for pipe end - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tube end protector that is attached to a 6iM section of a tube to protect the tube end.

When the end of a steel pipe is used with it exposed in the air or water, even if the outside surface is painted, the cut surface of the pipe is exposed, which not only looks bad, but also causes damage due to contact with air or water. Rust will form, making the appearance worse and shortening the lifespan of the tube.Also, there is a risk of injury from the sharp edges of the tube end.

Both for synthetic resin pipes and the L/end.

If the end of the tube is exposed, it looks bad and is prone to breakage when subjected to external forces such as impact.

In order to solve the above problem, Utility Model 57-2
Publication No. 05491, Japanese Utility Model Publication No. 57-205490,
A protective device to be attached to a pipe θ1111 is known, as described in Japanese Utility Model Application Publication No. 57-202095.

The device described in Japanese Utility Model Application Publication No. 57-205491 has a bottomed cylindrical main body with a folded flange extending on the upper edge thereof to form a gap commensurate with the wall thickness of the tube, and a side of the main body. It has a dangling protrusion formed on the circumferential surface. However, when attached to the tube end, the part that completely seals the tube is the folded flange surface, and the main body has a certain taper toward the back of the tube, and the main body Since there is a protrusion on the side circumferential surface of the tube i'/j: avoid creating a slight gap between the inner surface and the side circumferential surface of the section j. The drawback is that it cannot respond to even slight changes.

According to the protective equipment described in Japanese Utility Model Application Publication No. 57-205490.

The outer surface that is fitted into the pipe has a taper ridge around the protruding part of the stopper that has a certain sloped surface with a tip NI++, and the taper rib is compressed when fitting, but even after fitting. There is a drawback that a gap remains between the protruding part of the plug and the inner surface of the tube, and the bonding force is weak because it is not possible to make complete contact (η).

Moreover, the one described in Utility Model Application Publication No. 57-202 (No. 195).

A built-up bulge provided on the outer surface of the open end side of the fitting part presses the inner surface of the tube to attach the 11χ joint 4A to the tube end, and the bulge is in contact with the inner surface of the tube. There is a gap between the other parts and the inner surface of the tube, and complete adhesion cannot be achieved, and even if the inner surface of the tube and the bulge are bonded with adhesive, the adhesive area is small and the bond strength is weak. be.

In any of the above protective devices, a gap is created between the inner surface of the tube and the tip of the protective device, so if the water inside the tube freezes, the water in the gap will also freeze, and the tip of the protective device will be covered in ice. Due to the expansion of the ice, the entire protective gear is pushed out from the end of the tube and falls off, but there is a problem in that it becomes deformed.

The present invention solves the above-mentioned conventional drawbacks, improves the bondability by attaching it to the pipe f'i61 part and making it completely adhere to the inner surface of the pipe without creating a gap, and allows for the dimensional tolerance of the pipe to be improved. It can be used with full support, not only when the tube Φ111 is closed, but also when the tube end is opened and used, it prevents the end of the tube from being eaten away and improves the appearance (and the αj11 edge of the tube). There is no risk of injury, especially if the water inside the pipe freezes, it will not deform or fall off.

The object is to provide a tube end protector that has a simple structure and is easy to mold.

Hereinafter, five embodiments of the present invention will be described with reference to the drawings.

In Fig. 1, ■ is a short tube made of a highly elastic material such as semi-rigid vinyl chloride or rubber containing about 20 to 40 parts of plasticizer per 100 parts of resin. 5 Straight tube BI319 is the tube 2 to be inserted. It has an outer diameter equal to the inner diameter of 113, and a collar 11 is provided at one end. On the way to the other end of the outer circumferential surface of the short tube 1, the outer diameter gradually increases slightly to form a tapered surface 12, and after passing through the maximum diameter portion 13 of the outer circumferential surface, the outer diameter gradually decreases to a tip end 16. A gently tapered guide surface 14 is formed, and the outer diameter of the tip θ fi 1 portion 16 is made smaller than the outer diameter of the portion from one end where the collar 11 of the short pipe 1 is provided to the tapered surface 12. ing. Maximum diameter part 1
The outer diameter of tube 3 is slightly larger than the inner diameter of tube 2 to be inserted.

The inner surface of the short pipe 1 has a tip portion 16 slightly beyond the maximum diameter portion 13 on the outer periphery and a portion 17 beyond the starting portion 15 of the thickening of the sushi lump 17::i portion 16
As it bends, the inner diameter gradually becomes dog-shaped, and the tip 16 is made thinner.

If the wall thickness of the maximum diameter portion 13 is t and L-1, then the axial distance between the maximum diameter portion 13 and the thickness change starting portion 15 is i'ilt a
If 0 < a < 10) Q @ preferably, 0.5 < a
<0.7 (D7jj is the most desirable.

The tube end protector shown in this example can be easily manufactured by the q-1 molding method.

(3) Materials used for the upper end protector of the present invention include, for example, about 2 to 40 parts of i to 100 parts of resin:
Semi-rigid hinyl chloride, high pressure polyethylene with II plasticizer,
Any material with high elasticity such as Volip I copylene, nylon, com, etc. can be used.

The manner of use of the tube end protector of the present invention will be explained below.

Attach the tube end protector to the end 2 of the tube 2 from the i part 16.
All you have to do is push it in until the part 1 comes into close contact with the collar II. Immediately et al.

Since the tube end protector is made of a highly elastic material, as it is pushed into the tube orifice, the guide surface 14 will move against the tube ζ11. ) It is inserted while being compressed by elastic deformation at the inner peripheral edge, and then further inserted with the maximum diameter portion 13 being compressed by the inner surface of the tube, and the insertion is completed when the flange comes into close contact with the tube end 21.

In this case, if an adhesive is applied to the inner surface of the tube end 21 or the outer circumferential surface of the upper end protector and the tube is pressed firmly, friction Ii will be reduced and insertion will be facilitated, and bondability will also be improved.

In addition, the insertion of the tube, 7ij, and i protective equipment into the tube opening has been completed.

In a state where the maximum diameter portion 13 is pressed against the inner surface of the tube.

As shown in FIG. 2, the tapered surface 12 is deformed from the tapered surface base 18 and brought into close contact with the inner surface of the straight pipe section 19 together with the outer peripheral surface thereof.

When inserting the tube end protector into the tube orifice, the side of the maximum diameter portion 13 slides with pressure contact r14 on the inner surface of the tube, and the chi 1-'' surface 1
As a result of being pulled in the direction of the collar 11, a diameter-expanding force acts on the portion from the maximum diameter portion 13 to the distal end side 16 toward the inner surface of the tube 2. In this way, the previous θ11. ) When a diameter expansion force is applied to the side 16, the tube end protector made of an elastic abrasive material deforms.
As a result, the entire surface of the kite surface 14 is brought into close contact with the inner surface of the tube 2, and the tip end 16 is also brought into close contact with the inner surface of the tube 2 without any gap.

In the above embodiment, the maximum diameter portion 13 is formed in the shape of a ridgeline where the tapered surface 12 and the kite surface 14 intersect, or
If the curved surface is different from the maximum diameter part 13 shown in the figure, the pipe 2. ．．
This makes surface contact with the inner surface of 1, further improving the bonding performance between the two.

Further, the shape of the tip I6 may be sharp as shown in FIGS. I and 2, or may have a flat surface at the tip as shown in FIG. First 1! Part 1
If the tip 6 is curved outward in a range smaller than the outer diameter of the straight tube 19, the close contact between the tip 16 and the inner surface of the tube 2 will be even better.

The above embodiment is an example of a tube end protector for use with the tube yiA+ opened, but it can also be used as a tube end protector if the opening I'' on the brim side is closed.

Here are 18 examples of each part of the pipe end protector of the present invention.

Made of semi-rigid vinyl chloride as shown in Figure 1? a'l'711
V protection, D-2611m, b = 22.5
on, c = 24mm.

d = 24.9mm, L = 23m111. f-9ml
, g = 4 mm, a = I mmt = 1. ．． 75+
It is nm.

According to the L/end protector of the present invention, excellent effects as described below are achieved.

(1) Since the tip of the tube end protector is in close contact with the inner surface of the tube without any gaps, freezing of the water inside the tube may cause the contact surface to peel off, or the tip of the tube end protector to be deformed.
It does not fall off from the 1θl:), and the bond (1
: is extremely good.

(2) Pipe f'7j:) If the outer diameter of the tip of the protective device is smaller than the inner diameter of the tube, and the outer diameter of the maximum diameter part is larger than the inner diameter of the tube, the outer diameter of the tip and the maximum diameter are The size range of tubes that can be used with the tube end protector of Class 7 Lamp I, which can be used for tubes with a dimension of 1 month within the range of the outside diameter, is considerably wider than before.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing one embodiment of the tube end protector of the present invention, Fig. 2 is a cross-sectional view showing how the same is used, and Figs. 3 to 5 are main part cross-sectional views showing other embodiments. It is. ■...Short tube, 12...Dever surface, 13.13...
Maximum diameter part, 13...Plane part, 14...Guide surface, 1
5.15...Start of flesh change, 16.16...Ahead α1j11
Department Patent Issuer 1 Sekisui Chemical Co., Ltd. Representative Mototoshi Fujinuma

Claims (1)

[Claims] (1) The short tube has a flange at one end, and the outer diameter gradually increases from the middle toward the other end to form a tapered surface. A maximum diameter part is formed on the outer circumferential surface, and as you go from the maximum diameter part to the other end, the outer diameter decreases by Nli order again, forming a slightly tapered guide surface, and the outer diameter of the tip of the guide surface is that of a short pipe. The inner circumferential surface corresponding to the maximum diameter of the outer circumferential surface (= from the start of thickness change near J to the other end 2. A protective device made of a material with high elasticity and provided with an expanding surface whose inner diameter gradually increases.